Improvement in rotary pumps



UNITED STATES PATENT OEEICE.

C. H. HARRISON, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN ROTARY PUMPS.

Specification forming part of Letters Patent No. 43,204, dated June 2l, 1864.

To all whom it may concern.'

Be it known that I, GHAELEs H. HARRISON, of the city and countyof San Francisco, and State of California, have invented a new and Improved Pump 5 and Ido hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification.

Figure l is a perspective view of the pump with one of the ends removed. Fig. 2 represents the inner face of one of the ends. Fig. 3 represents the eccentric. Fig. 4 represents the inner4 cylinder. check-valve.

The general construction of rotary pumps used heretofore consists in an exterior cylinder within which a concentric interior cylinder revolves, which is provided at its circumference with slides or pistons operating against the inner circumference of the outer cylinder. This arrangement causes so much friction as to greatly reduce the efficiency of the pump, and the packing easily gets out of order, and rotary pumps, for ,these reasons,'have not gone into general use. Y

The object of my invention is to avoid the application of the said slides or pistons altogether; and it consists in the application within a hollow cylinder of a piston-cylinder, which 1s set upon and is rotated by an eccentric, and

whose circumference in its operation passes in a rolling motion all points of the inner circumference of the outer cylinder and serves as a suction as well as forcing cylinder simultaneously.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

`A represents the outer cylinder or shell of the pump with a chamber, B, on the top divided into two compartments by the partition C.

D is the opening for the suction-tube; E, the opening ofthe discharge-tube.

F represents the inner cylinder. It is set upon the eccentric L, which is provided at its circumference with strips s of lignum-vitte or vFig. 5 represents the other hard wood, to prevent friction, and which are not quickly affected by the action of the pump. By means of those strips s the eccentricity of the cylinder F in relation to shaft I can be adjusted.

a represents a partition, which is dovetailed into the cylinder F, and its end is connected with the slide bby means of the knuckle-jointlc.

The object of the partition a is to separate the suctionchamber of the pump from the discharge-chamber, and the slide B serves as a guide to the partition a, and its ends run in the grooves e of the ends of the pump.

I represents the driving-shaft, on which the eccentric L is secured.

r r are holes in the cylinder F for the passage of the water to lubricate the eccentric L and the strips s. l

H represents a dividing-partition across the pump-chamber for the "purpose of making the pump double acting, so as to obtain a continuous stream of water. To effect the latter, I set the eccentrics L in the two pump-chambers diametrically opposite on shaft I, and when used thus one of the pistons is forcing while the other is sucking, and I thus obtain a continuous and regular stream of Water.

M represents a check-valve of metal or leather, to prevent leakage in the incomplete circumference of cylinder A.

. Operation The shaft I revolves the eccentric L in the direction of the arrows, passing all joints of the inner cylinder, F, successively over the inner circumference of the outer cylinder, A, forming a vacuum in the suctionchamber, and forcing the water vthrough the outlet E, the sliding partition a forming a perfect division between the inlet'I) and outlet E. rIhe cylinder F in its operation has a rolling motion on the inner circumference of the cylinder A, in which no friction is caused between the two cylinders, and there is conse quently no wear between them. The only friction in this pump is between the strips s and the inner circumference of cylinder F, and should they wear off in using the pump they can easily be replaced, and they also serve to adjust the eccentricity of the pump, so as to keep the cylinders F and A in contact. The check-valve M prevents leakage in the incomplete portion of the cylinder A.

Having thus fully described the nature of my invention, what I claim herein as new, and desire to secure by Letters Patent, is-

l. The combination, with cylinder A, ot' the eccentric L and cylinder F, when the latter has a rolling motion on the inner circumference of cylinder A, substantially in the manner and for the purposes described.

2. In combination with the cylinder A, eccentric L, and cylinder F, the partition G, dividing the chamberB in two compartments, one of which is connected with the suction-pipe, and the other with the discharge-pipe, of the pump, substantially as herein described.

3. The combination of the cylinder F with the movable partition a, joint Je, and slide b, substantially in the manner and for the purposes described.

4. The hinged check-valve M, when applied to rotary pumps, and when constructed substantially as herein described.

5. The application to the eccentric L ofthe friction-strips S when made of hard Wood, so

as to Work on the inner circumference of the cylinder F, substantially in the manner and for the purposes herein described.

6. The holes r on the circumference of the cylinder F, when the latter is constructed and arranged substantially as herein described.

` C. H. HARRISON. Witnesses GHAs. R. BOND, A. S. SIBBEY. 

